AZ-900 Describe Azure architecture and services Practice Question
Which Azure service provides a fully managed message broker that supports queues and publish-subscribe topics for enterprise application integration?
⚠ Common exam trap
It's easy for candidates to confuse Azure Service Bus with Azure Queue Storage, mistakenly thinking both offer the same publish-subscribe capability, but Queue Storage only supports simple queues without topics or advanced enterprise features.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Azure Service Bus
Azure Service Bus is a fully managed enterprise message broker that supports both queues (point-to-point) and topics (publish-subscribe) with features like dead-lettering, sessions, and transactions. It is designed for reliable, ordered message delivery in enterprise application integration scenarios, using AMQP, SBMP, or HTTPS protocols.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Azure Event Hubs
Why it's wrong here
Azure Event Hubs is a big-data event ingestion platform optimized for high-throughput telemetry and event streaming, capable of ingesting millions of events per second. It uses consumer groups for parallel stream processing rather than the point-to-point or publish/subscribe messaging semantics found in Service Bus. Its purpose is to feed analytics pipelines, not to provide reliable enterprise message queues with dead-lettering or sessions.
- ✓
Azure Service Bus
Why this is correct
Azure Service Bus is an enterprise message broker that fully supports both queues for point-to-point communication and topic subscriptions for publish/subscribe patterns. It includes advanced reliability features such as sessions, transactions, duplicate detection, scheduled delivery, forwarding, and dead-letter queues, making it ideal for complex application integration. This is the correct answer because the question's requirement for a general-purpose message broker with topics and queues matches Service Bus exactly.
- ✗
Azure Queue Storage
Why it's wrong here
Azure Queue Storage, built on Azure Storage, provides a simple, low-cost queue with a REST API for storing and retrieving large numbers of messages. It offers at-least-once delivery and visibility timeouts but lacks enterprise broker capabilities such as topic subscriptions, sessions, transactions, scheduled delivery, and dead-lettering. The absence of publish/subscribe semantics and advanced message control makes it unsuitable for a scenario requiring the full enterprise messaging functionality of Service Bus.
- ✗
Azure Notification Hubs
Why it's wrong here
Azure Notification Hubs is a dedicated push notification engine that sends targeted, high-volume push notifications to mobile and desktop platforms using device registrations and tags. It does not support message queues, topics, sessions, or enterprise application-to-application integration patterns. Its scope is exclusively fan-out to user devices, not brokered messaging between enterprise services.
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